Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bcde937ae47e1ab…

MALICIOUS

PDF

93.7 KB Created: 2021-06-30 08:54:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4dfdadab15f5302ee18c5e9a35e30aee SHA-1: 1ec7dfec2bb3fde4bd4d284db1f2142bb30330eb SHA-256: 4bcde937ae47e1aba1fd91ab0e3055992a430bc5d57719a902b43d4814a8f078
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised CMS upload directories, indicating a phishing or SEO manipulation attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with malicious PDFs designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1609e7241ea6e7---dopijupedapupo.pdf
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c881ad15ff---12631812583.pdf
    • http://eiak.org/upload/editor/files/fumuwezezesizasulepozux.pdf
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/a063f384051823f28c5e08d34229e83b/28426143675.pdf
    • http://glina-master.ru/admin/ckfinder/userfiles/files/zeraxekuzifadekavaxogizuj.pdf
    • http://okmarin.ru/userfiles/file/59989841801.pdf
    • http://hainescentreasia.com/images/file/92230805072.pdf
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/1453l4vaaoumv9sh882tj97ih7/87172936226.pdf
    • http://www.asap-recruitment.net/upload/file/73859985466.pdf
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/750adfa004bc6c34faed2cad72aba1a3/91082313730.pdf
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/4l6qfb7vf0nkq4nr8aq2n8k8c9/80274518537.pdf
    • http://coming-c.com/userfiles/file/40935427630.pdf
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/0b6f61728bcb68d71d726b76d1e526b5/4812777720.pdf
    • http://www.malagatour.es/ckfinder/userfiles/files/36657605810.pdf
    • http://ed-web.cz/userfilesfile/begifixaxosobesut.pdf
    • http://gemculture.com/userfiles/file/13920919191.pdf
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160886d4f61a8b---98675001241.pdf
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071acfc3624a---fikatelesogomabuvaluxe.pdf
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/f859522413d1d63619d4d089edb34b0a/nelibademeli.pdf
    • http://vervesimuhub.com/userfiles/file/98645620055.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3041ca987732643aa6f4fcb83c6c0d89/zafunikotamaze.pdf
    • http://ledson.ru/upload_picture/44787166882.pdf
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160989a331fc37---mevolirikaboxaxoku.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=calculate+the+standard+enthalpy+of+combustion
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1c1.bin
15a5002b3e03501a3cf89a804344d425c279c91b4769d74f9bdd0ba13469eb7e
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C1 17576 bytes
font_01_sfnt_off0001204a.bin
1cfb00680a8a18ef5d5af493cc5b57cfe410abeba37087ee2ecd799c98b61e68
pdf-font-stream PDF embedded font (sfnt) at offset 0x1204A 16168 bytes
font_02_sfnt_off000135e7.bin
7f4957dcce64ac374474b2ac1a70c2771b0e7ed1fd5e3a7a370ce1a3fca404ae
pdf-font-stream PDF embedded font (sfnt) at offset 0x135E7 11268 bytes
font_03_sfnt_off00014ff6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14FF6 16792 bytes